The two files works under JBoss AS 6, but not with JBoss AS 7.
But for JBoss AS 6 I have to move my classes from the backend to the package com, because the system only searches there. So I get a ClassNotFoundException for com.DataAccessObjectRemote, but it is in the package de.h3llghost.data.
It is annoying. But that doesn't work for JBoss AS 7.